Power outages are likely to continue, says the International Energy Agency (IEA), because the world will find it difficult to raise the global investment of $16.6 trillion needed over the next 25 years to keep electricity production growing at 2 percent a year. But there are many ways countries can save energy in a hurry, according to a new IEA report drawing on case studies of nations that faced shortages.

An unexpected complication at power plants—which may be related to greenhouse gases—have been plagues of jellyfish clogging up water pipes. In late June, jellyfish clogged a cooling pipe at a Japanese nuclear power plant—the first time that had happened in 14 years of operation. In Israel, jellyfish likewise clogged a cooling pipe at another power plant—requiring construction equipment to scoop up many dumpsters’ worth of the creatures.

U.S. commercial flights can now use blends of biofuels made from plants and organic waste, after winning approval from a U.S. standards group. On June 29, Dutch airline KLM made the first commercial biofueled flight, from Amsterdam to Paris, and the airline plans to expand use of a 50-50 blend of jet fuel and HEFA—hydro-processed esters and fatty acids made from used cooking oil.